public Init ( bool forEncryption, byte key ) : void | ||
forEncryption | bool | |
key | byte | |
Результат | void |
public static byte[] DecryptIGE(byte[] ciphertext, byte[] key, byte[] iv) { var iv1 = new byte[iv.Length/2]; var iv2 = new byte[iv.Length/2]; Array.Copy(iv, 0, iv1, 0, iv1.Length); Array.Copy(iv, iv1.Length, iv2, 0, iv2.Length); AesEngine aes = new AesEngine(); aes.Init(false, key); byte[] plaintext = new byte[ciphertext.Length]; int blocksCount = ciphertext.Length/16; byte[] ciphertextBlock = new byte[16]; byte[] plaintextBlock = new byte[16]; for(int blockIndex = 0; blockIndex < blocksCount; blockIndex++) { for(int i = 0; i < 16; i++) { ciphertextBlock[i] = (byte) (ciphertext[blockIndex*16 + i] ^ iv2[i]); } aes.ProcessBlock(ciphertextBlock, 0, plaintextBlock, 0); for(int i = 0; i < 16; i++) { plaintextBlock[i] ^= iv1[i]; } Array.Copy(ciphertext, blockIndex * 16, iv1, 0, 16); Array.Copy(plaintextBlock, 0, iv2, 0, 16); Array.Copy(plaintextBlock, 0, plaintext, blockIndex * 16, 16); } return plaintext; }
public static byte[] EncryptIGE(byte[] originPlaintext, byte[] key, byte[] iv) { byte[] plaintext; using (MemoryStream plaintextBuffer = new MemoryStream(originPlaintext.Length + 40)) { //using(SHA1 hash = new SHA1Managed()) { //byte[] hashsum = hash.ComputeHash(originPlaintext); //plaintextBuffer.Write(hashsum, 0, hashsum.Length); plaintextBuffer.Write(originPlaintext, 0, originPlaintext.Length); while (plaintextBuffer.Position % 16 != 0) { plaintextBuffer.WriteByte(0); // TODO: random padding } plaintext = plaintextBuffer.ToArray(); } var iv1 = new byte[iv.Length / 2]; var iv2 = new byte[iv.Length / 2]; Array.Copy(iv, 0, iv1, 0, iv1.Length); Array.Copy(iv, iv1.Length, iv2, 0, iv2.Length); AesEngine aes = new AesEngine(); aes.Init(true, key); int blocksCount = plaintext.Length / 16; byte[] ciphertext = new byte[plaintext.Length]; byte[] ciphertextBlock = new byte[16]; byte[] plaintextBlock = new byte[16]; for (int blockIndex = 0; blockIndex < blocksCount; blockIndex++) { Array.Copy(plaintext, 16 * blockIndex, plaintextBlock, 0, 16); //logger.info("plaintext block: {0} xor {1}", BitConverter.ToString(plaintextBlock).Replace("-", ""), BitConverter.ToString(iv1).Replace("-", "")); for (int i = 0; i < 16; i++) { plaintextBlock[i] ^= iv1[i]; } //logger.info("xored plaintext: {0}", BitConverter.ToString(plaintextBlock).Replace("-", "")); aes.ProcessBlock(plaintextBlock, 0, ciphertextBlock, 0); //logger.info("encrypted plaintext: {0} xor {1}", BitConverter.ToString(ciphertextBlock).Replace("-", ""), BitConverter.ToString(iv2).Replace("-", "")); for (int i = 0; i < 16; i++) { ciphertextBlock[i] ^= iv2[i]; } //logger.info("xored ciphertext: {0}", BitConverter.ToString(ciphertextBlock).Replace("-", "")); Array.Copy(ciphertextBlock, 0, iv1, 0, 16); Array.Copy(plaintext, 16 * blockIndex, iv2, 0, 16); Array.Copy(ciphertextBlock, 0, ciphertext, blockIndex * 16, 16); } return(ciphertext); }
public static byte[] EncryptIGE(byte[] originPlaintext, byte[] key, byte[] iv) { byte[] plaintext; using (MemoryStream plaintextBuffer = new MemoryStream(originPlaintext.Length + 40)) { //using(SHA1 hash = new SHA1Managed()) { //byte[] hashsum = hash.ComputeHash(originPlaintext); //plaintextBuffer.Write(hashsum, 0, hashsum.Length); plaintextBuffer.Write(originPlaintext, 0, originPlaintext.Length); while(plaintextBuffer.Position%16 != 0) { plaintextBuffer.WriteByte(0); // TODO: random padding } plaintext = plaintextBuffer.ToArray(); } var iv1 = new byte[iv.Length/2]; var iv2 = new byte[iv.Length/2]; Array.Copy(iv, 0, iv1, 0, iv1.Length); Array.Copy(iv, iv1.Length, iv2, 0, iv2.Length); AesEngine aes = new AesEngine(); aes.Init(true, key); int blocksCount = plaintext.Length/16; byte[] ciphertext = new byte[plaintext.Length]; byte[] ciphertextBlock = new byte[16]; byte[] plaintextBlock = new byte[16]; for(int blockIndex = 0; blockIndex < blocksCount; blockIndex++) { Array.Copy(plaintext, 16*blockIndex, plaintextBlock, 0, 16); //logger.info("plaintext block: {0} xor {1}", BitConverter.ToString(plaintextBlock).Replace("-", ""), BitConverter.ToString(iv1).Replace("-", "")); for(int i = 0; i < 16; i++) { plaintextBlock[i] ^= iv1[i]; } //logger.info("xored plaintext: {0}", BitConverter.ToString(plaintextBlock).Replace("-", "")); aes.ProcessBlock(plaintextBlock, 0, ciphertextBlock, 0); //logger.info("encrypted plaintext: {0} xor {1}", BitConverter.ToString(ciphertextBlock).Replace("-", ""), BitConverter.ToString(iv2).Replace("-", "")); for(int i = 0; i < 16; i++) { ciphertextBlock[i] ^= iv2[i]; } //logger.info("xored ciphertext: {0}", BitConverter.ToString(ciphertextBlock).Replace("-", "")); Array.Copy(ciphertextBlock, 0, iv1, 0, 16); Array.Copy(plaintext, 16*blockIndex, iv2, 0, 16); Array.Copy(ciphertextBlock, 0, ciphertext, blockIndex * 16, 16); } return ciphertext; }